Multiple linear regression analysis to determine independent factors associated with psychomotor developmental index (PDI) scores
| Values are effect size (95% confidence interval) in PDI units of significant factors only. | |
| †Parenchymal pathology and/or ventriculomegaly on final cranial ultrasound scan. | |
| *p<0.05, **p<0.01, ***p<0.001. | |
| Antenatal | |
| Maternal smoking in pregnancy | −4.03 (−7.16 to −0.90)* |
| Male | −4.30 (−7.26 to −1.34)** |
| Perinatal and day 1 postnatal | |
| Primigravida | 3.37 (0.28 to 6.45)* |
| Maternal smoking in pregnancy | −3.42 (−6.52 to −0.31)* |
| Male | −4.97 (−7.92 to −2.03)** |
| Vaginal breech delivery | 4.08 (0.54 to 7.61)* |
| To discharge | |
| Primigravida | 3.13 (0.16 to 6.10)* |
| Male | −5.23 (−8.07 to −2.40)*** |
| Vaginal breech delivery | 4.29 (0.93 to 7.65)* |
| Breast milk in hospital | 5.35 (1.20 to 9.49)* |
| Supplemental oxygen at 36 weeks | −4.32 (−7.40 to −1.23)** |
| Significantly abnormal USS† | −5.81 (−10.48 to −1.14)* |